Android应用开发中Fragment与Activity间通信示例讲解

可以看出，这里就只有一个TextView

2.在layout里新建fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://www.easck.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="#ffff00"
 android:orientation="vertical" >
 <TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="this is fragment 2"
 android:textColor="#000000"
 android:textSize="25sp" />
 <Button
 android:id="@+id/button"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 1" />
 <Button
 android:id="@+id/button2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 2" />
 <Button
 android:id="@+id/button3"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="num 3" />
</LinearLayout>

这里是三个button

3.创建类Fragment1继承Fragment

package lgx.fram.framents;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
  Bundle savedInstanceState) {
 return inflater.inflate(R.layout.fragment1, container, false);
 }
}

重写onCreateView()方法，这里 return inflater.inflate(R.layout.fragment1, container, false); 这句话是重点

4.创建类Fragment2继承Fragment

package lgx.fram.framents;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class Fragment2 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
  Bundle savedInstanceState) {
 return inflater.inflate(R.layout.fragment2, container, false);
 }

 TextView textview;
 Button button, button2, button3;

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
 super.onActivityCreated(savedInstanceState);
 button = (Button) getActivity().findViewById(R.id.button);
 button2 = (Button) getActivity().findViewById(R.id.button2);
 button3 = (Button) getActivity().findViewById(R.id.button3);
 textview = (TextView) getActivity().findViewById(R.id.fragment_text);
 button.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button.getText());
  }
 });
 button2.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button2.getText());
  }
 });
 button3.setOnClickListener(new OnClickListener() {

  @Override
  public void onClick(View v) {
  textview.setText(button3.getText());
  }
 });
 }
}
button = (Button) getActivity().findViewById(R.id.button); 
								 
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